JPH0386320A - Driving device for roller leveler - Google Patents

Abstract

PURPOSE:To reduce torque circulation and to smoothly perform correcting work by interposing a clutch on a part or all of spindle of work rolls on which negative direction torques are generated in a group of work rolls on preceding stage and a group of work rolls on poststage. CONSTITUTION:Torque circulation which is generated in a driving system where the work rolls are divided into three groups of preceding stage, middle stage and post stage is prevented. Necessary net torque is the sum of torque of four work rolls R1 - R4 and it is smaller than the sum of torque of the 2nd and 3rd work rolls R2, R3. Therefore, if the sum of the negative torque could be made zero, it is possible to reduce also torque of the work rolls R2, R3. That is, it is able to make negative torque zero if the work rolls are made to idle by cutting the clutches while correcting by interposing in freely attachably and detachably the clutches on the spindles of all or a part of the work rolls where negative torque is generated. By this way, it is possible to reduce torque circulation and correcting work can be smoothly done.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a drive device for a roller leveler.

<Prior art> In general, the straightening ability of a roller leveler depends on the degree to which it imparts a large curvature to the processed material, and in order to impart that large curvature, it is necessary to supply the power necessary to continuously impart the curvature. . On the other hand, in order to provide a large curvature, the diameter of the work roll is preferably as small as possible.

Usually, a roller leveler, as shown in Figures 3 and 4,
A plurality of work rolls 2 arranged in a staggered manner in two rows in the vertical direction of the material to be straightened 1 are driven by a speed reducer 4. Binion stand 5. The bottom of the tank is connected to the tank via a spindle 6 and driven to rotate.

By the way, when distributing power from the electric motor 3 to the work rolls 2 in the roller leveler with the bottom of the tank as described above, since each work roll is fixedly connected by a reduction gear 4° pinion stand 5, The power ratio distributed to each roll up to the exit side can be relatively varied depending on the operating conditions, but depending on the operating conditions, concentrated power may be required for a certain work roll, and even if the total power is small, However, excessive torque may be generated on the roll shaft and the spindle connected to it.

In other words, when using a roller leveler, in general, when performing tilting reduction with a strong pressure on the entry side and a light reduction on the exit side, so-called "torque circulation" occurs, and even though the net torque acting on the actual straightening is small, , excessive torque is generated on a particular work roll.

Here, torque circulation in such a roller leveler will be specifically explained. Now, as shown in Figure 5,
Assuming that the speed at the first work roll 2 is Vwl, the surface speed of the material to be straightened is V□, and the radius of curvature of the material 1 to be straightened is ρ1, ■ The bending curvature Kl (-1
/ρI) is different, so the surface speed VS+ of the material to be straightened is different for each roll; ■ Since each roll is driven by the same electric drive system 113, the speed Vl11 of each roll is constant; From the above, the relative velocity ΔviΔv between the surface of the material 1 to be straightened and the roll 2 in each roll expressed by the following equation (1), =V
, l−V□ ・・・−・・・・・−・・・・−・・・
--- (1) is different, and when ΔVl is + (positive), a positive torque is generated, and when it is − (negative), a negative torque is generated.

On the other hand, let the thickness of the material to be straightened l be t, and its center speed be ■,
Then, the surface speed Vsl of the material to be straightened at each roll is expressed by the following equation (2).

Vwl-Vc/(1+(t/2)Ki)
-(2) Also, the transmission torque TI that can be transmitted by each roll is
If the friction coefficient between the roll and the material to be straightened is μ length, and the straightening reaction force applied to each roll is Ft, then the following equation (3) 1 equation % (3) Here, R: Roll radius μm-f (ΔV+ ) From this, the excessive torque due to torque circulation increases as the bending curvature KI, that is, the reduction amount increases, and also increases as the straightening reaction force F1 increases.

As a conventional measure to suppress such torque circulation, for example, as disclosed in Japanese Patent Laid-Open No. 59-54420, a torque control TlLT is installed on the output shaft of all work rolls.
There is a method to prevent excessive torque by providing an ED mechanism, or, as disclosed in Japanese Patent Laid-Open No. 60-99430, the drive system of each work roll is divided into a plurality of parts so that the axial torque of each drive system can be adjusted individually. Means have been proposed to enable control to move in the positive direction.

<Problems to be Solved by the Invention> However, with the former prevention means disclosed in JP-A No. 59-54420, the capacity of the torque control joint that can be installed is limited due to installation space constraints. A high-pressure leveler aimed at straightening high-strength materials has problems in that it lacks capacity or is constantly used in a state of slippage, resulting in a lack of reliability.

Furthermore, the latter method disclosed in Japanese Patent Application Laid-Open No. 60-99430 has the disadvantage that it is not possible to prevent torque circulation occurring in the divided drive system. In particular, as shown in Fig. 6, a type in which the front work roll group A and the rear work roll group C have small diameters and the middle work roll group B has a large diameter is combined to improve the straightening effect on thin materials to be straightened. In this leveler, torque circulation occurs within the small diameter roll groups of the front work roll group A and the rear work roll group C, causing excessive torque to be applied to some of the rolls, causing the roll shaft,
A problem arises in that sufficient correction cannot be performed due to constraints on the strength of the spindle, etc.

SUMMARY OF THE INVENTION An object of the present invention is to provide a roller leveler drive device that solves the L1 problem of the prior art as described above.

<Means for Solving the Problems> The present invention comprises a plurality of work rolls arranged in a staggered manner in two rows above and below the material to be straightened along the running direction of the material to be straightened, in groups of front stage, middle stage, and rear stage. In a drive device for a roller leveler that straightens the material to be straightened by dividing the workpiece into three parts and simultaneously driving them through a spindle and driving the workpiece simultaneously by a drive device through a spindle, the workpiece generates a negative torque in the first work roll group and the second work roll group. This is a roller leveler drive device characterized by interposing a clutch in the spindle of a part or all of the rolls.

Note that a clutch may be interposed in the spindles of some or all of the work rolls that generate torque in the positive direction in the front work roll group and the rear work roll group.

Effect> The present inventors have made extensive studies to prevent the torque circulation that occurs in the drive system of JP-A-60-99430, which divides the work roll into three groups: front stage, middle stage, and rear stage. As a result, we found that torque circulation occurs in each of the divided drive systems, but torque circulation becomes especially large in the front work roll group with a large reduction amount during forward bus, and in the rear work roll group during reverse bus. Based on this knowledge, we have completed the present invention.

FIG. 7 exemplifies the situation in which torque circulation occurs in a front-stage work roll group A having four work rolls in a roller leveler in which the work rolls are divided into three parts.

As shown in the figure, the torque is in the positive direction for the second and third work rolls Rt and Rs, which have large bending curvatures, and the torque is in the negative direction for the 1.4th work rolls R+ and Ra. 3rd work roll Rz, 1.4 in Rz
It can be seen that the negative torque of the th work rolls Rr and Ra is borne.

Essentially, the net torque required for the straightening work is the sum of the torques of the four work rolls R1 to R4 from ■ to the fourth, and the second and third work rolls Rt.

From this, if all or part of the negative torque can be reduced to 0 by some means, it is possible to reduce the torque of the 2.3rd work rolls Rt and Rz as well. be. In other words, if a removable clutch is interposed on all or part of the spindle of the work roll that produces negative torque, and the clutch is disengaged and idled during straightening, all or part of the negative torque may be removed. Since a part of the torque can be set to 0, it is possible to reduce the influence of torque circulation.

Now, if the allowable torque at the spindle, which is the weakest part of the drive system, is T, then the transmission torque TI of each roll determined by the above equation (3) must satisfy the following equation (4). .

Tmu<T, −・・−・−・−
...--(4) Therefore, in the case of formula (5) below, the clutch is disengaged.

In addition, in this case, the clutch is TI<0 and its absolute (11
One roll with the maximum T and l is cut, and T is calculated again by setting the friction coefficient μ of the roll at clutch release to O, and clutch release and calculation are continued until the above formula (4) is satisfied.

In addition, the clutch release roll is T1>0 and its absolute value is 1T! You can get the same effect by starting with the highest roll of 1. In other words, the torque of each work roll is determined according to the difference in the bending curvature of each work roll, so by installing the clutch in the above method, the bending curvature of the work roll that has lost its torque transmission ability becomes the torque WI. No longer involved in the ring. As a result, the difference in bending curvature between work roll groups with the same drive system becomes smaller,
Torque circulation can be reduced.

In this way, the occurrence of torque circulation can be prevented by reducing the torque to O by disengaging the clutches of all or part of the work rolls that have a negative torque or positive torque, or a part that has a peak torque. It is possible.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view showing a roller leveler driving device according to an embodiment of the present invention.

As shown in the figure, the roller leveler is divided into three groups: a front work roll group 2A consisting of four rolls, a middle work roll group 2B consisting of six rolls, and a rear work roll group 2C consisting of four rolls.

The front work roll group 2A is connected to the reducer 4A by the electric motor 3A.
, is driven via the pinion stand 5A and spindle 6A, and the middle work roll group 2B is decelerated by the electric motor 113B @4B, pinion stand 5B, spindle 6
The latter work roll group 2C is driven by an electric motor 3C via a reduction gear 4C, a pinion stand 5C, and a spindle 6C.

Furthermore, clutches 7 are interposed in the spindles 6A of the 1.4th work rolls R1 and R4 of the front work roll group 2A and the spindles 6C of the 1.4th work rolls R11 and Ro of the rear work roll group 2C, respectively. .

When straightening the material to be straightened, if the relationship between the allowable torque T of the spindle and the transmission torque Tr of each roll does not satisfy the above equation (4), that is, the above equation (5) holds true. When, in the forward path, the previous work roll group 2
The clutch 7 of the spindle 6A of the 1.4th work rolls R1 and R4 of A, and the 4.1st work roll R14+R of the rear work roll group 2C in the reverse bus.
The clutches 7 of the 11 spindles 6C are sequentially disengaged.

Fig. 2 shows the 1.4th work rolls R, , R of the front work roll group 2A when the material to be straightened 1 is straightened in the normal pass.
, shows the torque value of each work roll when the clutch 7 of , is disengaged and corrected.

As is clear from the figure, 1.4th work roll R,
, R, becomes 0, and as a result, it can be seen that the torque of 2.3rd work row J and Rt and Rs are reduced.

<Effects of the Invention> As explained above, according to the present invention, a clutch is interposed in the spindles of some or all of the work rolls that generate negative torque due to torque circulation within a group of work rolls with a large rolling reduction. Since the clutches are sequentially disengaged when torque is generated in the negative direction, it is possible to reduce torque circulation, and the correction work can be performed smoothly.

Note that the same effect can be obtained by interposing a clutch in some or all of the spindles of the work rolls that generate forward torque so that the clutches are disengaged when the forward torque is generated.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a roller leveler driving device according to an embodiment of the present invention, FIG. 2 is a characteristic diagram showing the action of the present invention, and FIG.
The figure is a side view showing a conventional example of a roller leveler, and FIG.
FIG. 5 is a plan view showing a conventional example of a roller leveler, FIG. 5 is an explanatory diagram of the speed relationship of the material to be straightened, FIG. 6 is a side view showing an example of dividing a work roll, and FIG. 7 is a diagram showing roll torque distribution. It is a characteristic diagram. l...Material to be straightened, 2A...Previous work roll group. 2B... middle work roll group, 2C... rear work roll group, 3A, 3B, 3C... electric motor. 4A, 4B, 4C...Reducer. C... Binion stand, 6A. Pindle, 7...Clutch. 5A, 5B, 5 6B, 6C...S

Claims (1)

[Scope of Claims] 1. A plurality of work rolls arranged in a staggered manner in two rows above and below the material to be straightened along the traveling direction of the material to be straightened,
In a drive device for a roller leveler that straightens a material to be straightened by dividing the roller leveler into three groups, a middle stage and a rear stage, and driving them simultaneously by drive devices via spindles, the negative direction within the front stage work roll group and the rear stage work roll group is provided. A drive device for a roller leveler, characterized in that a clutch is interposed in a spindle of a part or all of a work roll that generates a torque of . 2. The drive device for a roller leveler according to claim 1, wherein a clutch is interposed in the spindles of some or all of the work rolls that generate torque in the positive direction in the first work roll group and the second work roll group. .